I would like to see better integration of tablet devices. Examples? Connection of pen pressure with adjustment brush flow. Another idea is to automatically switch from A/B brushes to Erase while... tablet pen is in eraser position.

The wacom tablets have an excellent airbrush tool with a little wheel which can be adjusted while drawing. It would be very useful to be able to adjust i.e. the size of the brush tool in lightroom with this. It would not even have to be continous, just being able to change it while the pen is up would be helpful.
The airbrush:
http://www.wacom.eu/index2.asp?lang=e...

maybe you can activate the erasing functionality by activating the Alt key as a modifier when using the eraser (Wacom settings).
Nevertheless I would also like to have better tablet support in Lightroom